Method for producing a volumetric flow central value

Details Method for producing a volumetric flow central value Method for producing a volumetric flow central value

1994-02-24

1995-06-06

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

Mold having movable core or movable pin

249 96, 2643287, 425DIG58, B29C 4544

Patent

active

054217180

ABSTRACT:
A flow control valve including a movable part and a housing for accommodating the movable part may be produced by molding the components in sequential steps. Preferably, the housing is molded in a first step and the movable part is molded in an at least partially closed position in a second step in the same mold. This method enables the surface of the housing to serve as at least a portion of the mold for forming a substantially sealing portion of the movable part such that a very close tolerance between these components is achieved. The movable part is preferably a butterfly disc and the housing is preferably a butterfly valve housing.

REFERENCES:
patent: 3843088 (1974-10-01), McLoughlin et al.
patent: 4999142 (1991-03-01), Fukushima et al.

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